Pokémon, but I'm forced to be the ghost type champion

Story of: Pokémon, but I'm forced to be the ghost type champion

There is a young man named Xingye in Weibai Town in the Pokémon world. He was originally a college student on a certain blue star. Because he accidentally traveled to the Pokémon world and had the blessing of the system, he thought he could make a name for himself in the world. Easily become the strongest in the world.But he found that the system forced him to only conquer ghost-type Pokémon...